American 220 wall heater problem...

[roughshawd]

The 220v thermostat on my wall heater is obsolete, and I am having problems finding a replacement. I have maybe 5 of these heaters, and they all need the thermostat. Can you help me to diagnose and test these? I checked the resistance, tested the motor, the heating element still has continuity, and everything looks good. The source power was made from 2 separate in 110v sources, instead of a dedicated 220v circuit so the problem might be induced...????

 

[Externet]

Use a voltmeter to diagnose !
If you cannot repair the thermostats because refuse to turn or points are worn out, I bought this and cured mine :

--> https://www.aliexpress.us/item/2255...8!sea!US!171220328&curPageLogUid=eEUsfd0K0ucr

 

[Externet]

Use a voltmeter to diagnose and that your two phases do make 230V. !
If you cannot repair the thermostats because refuse to turn or points are worn out, I bought this and cured mine :

--> https://www.aliexpress.us/item/2255...8!sea!US!171220328&curPageLogUid=eEUsfd0K0ucr

 

[Minder]

The 220v thermostat on my wall heater is obsolete, and I am having problems finding a replacement. I have maybe 5 of these heaters, and they all need the thermostat. Can you help me to diagnose and test these? I checked the resistance, tested the motor, the heating element still has continuity, and everything looks good. The source power was made from 2 separate in 110v sources, instead of a dedicated 220v circuit so the problem might be induced...????

In N.A. it is 240v 120v-0v-120v.
The 240 v is the same as 2x120v.
The thermostats do not appear to be voltage sensitive, so any equivalent should suffice.

 

[roughshawd]

Rephrase... Sorry!
Can the rotary thermostats that control wall heaters be reworked?

 

[crutschow]

The source power was made from 2 separate in 110v sources

Did you measure 220V between those two sources?

 

[roughshawd]

The little fan motor is reading 171 ohms. I did the math. That's what a 33v motor is supposed to have. A 240v motor that uses .195a.is supposed to have 1230ohms.
What gauge wire do I rewrap the coil with?

What ohms should a 220 fan motor readout? This one here is impossible to read. I need to rewrap the induction coil on the field.

Did you measure 220V between those two sources?

Source power is okeydoke!

Motor coils cooked. !!!

 

[kellys_eye]

As ever, you're over-thinking things. There's probably nothing wrong with the motor. Leave it alone (for now).

Remove the thermostat. Point a hot air gun at it and see (listen) for the bi-metallic strip 'clicking'. If it clicks the metallic strip (mechanical action) is fine. Clean the contacts of the thermostat. Re-heat it and check the contacts close (use your meter on the continuity range). If the contacts show a short (when heated and clicking) then refit the thermostat.

All should be good from there.

 

[Minder]

The little fan motor is reading 171 ohms. I did the math. That's what a 33v motor is supposed to have. A 240v motor that uses .195a.is supposed to have 1230ohms.
What gauge wire do I rewrap the coil with?

What ohms should a 220 fan motor readout? This one here is impossible to read. I need to rewrap the induction coil on the field.

You cannot calculate the amperage of a AC inductive device (e.g. motor) from a resistance reading.
It possesses inductive reactance which reads a lot higher than the DC resistance, this is what limits the current

 

[roughshawd]

As ever, you're over-thinking things. There's probably nothing wrong with the motor. Leave it alone (for now).

Remove the thermostat. Point a hot air gun at it and see (listen) for the bi-metallic strip 'clicking'. If it clicks the metallic strip (mechanical action) is fine. Clean the contacts of the thermostat. Re-heat it and check the contacts close (use your meter on the continuity range). If the contacts show a short (when heated and clicking) then refit the thermostat.

All should be good from there.

Wow, a simple device tests device fix! Thanks for really testing thermostat!

 

[roughshawd]

Thermocouple burned out. I'm lucky I had a spare. Haven't tested it yet but I'm fairly certain that is what happened.

 

[roughshawd]

As ever, you're over-thinking things. There's probably nothing wrong with the motor. Leave it alone (for now).

Remove the thermostat. Point a hot air gun at it and see (listen) for the bi-metallic strip 'clicking'. If it clicks the metallic strip (mechanical action) is fine. Clean the contacts of the thermostat. Re-heat it and check the contacts close (use your meter on the continuity range). If the contacts show a short (when heated and clicking) then refit the thermostat.

All should be good from there.

Thermostats are fine. I found on one of the heaters the thermocouple that heats up before the fan turns on is already on, so it's shorted out. Because these aren't made to repair, they sell the entire element package as one unit. Where a person might get some thermocouples like these is beyond me. So. Once again. Drop the dime, replace the unit.

 

[ivak245]

The first picture is a thermal fuse. They will measure as a short if good. There is a temperature usually stamped on the side. The second picture is of a "Klixon" which will go open when a set temp. is reached. This is what acts as your thermostat or it could be an overload. A thermocouple is a bimetallic temperature sensor, which needs to be connected to a circuit so the temp. can be read or controlled.